mastodon/app/models/follow_suggestion.rb

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class FollowSuggestion
def self.get(for_account_id, limit = 6)
neo = Neography::Rest.new
account_ids = neo.execute_query('START a=node:account_index(Account={id}) MATCH (a)-[:follows]->(b)-[:follows]->(c) WHERE a <> c AND NOT (a)-[:follows]->(c) RETURN DISTINCT c.account_id', id: for_account_id)
Account.where(id: account_ids['data'].map(&:first)).limit(limit) unless account_ids.empty?
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rescue Neography::NeographyError, Excon::Error::Socket => e
Rails.logger.error e
[]
end
end